4.9x^2+14x-0=12

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Solution for 4.9x^2+14x-0=12 equation:


Simplifying
4.9x2 + 14x + 0 = 12

Reorder the terms:
0 + 14x + 4.9x2 = 12
Remove the zero:
14x + 4.9x2 = 12

Solving
14x + 4.9x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 14x + 4.9x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 14x + 4.9x2 = 0

Begin completing the square.  Divide all terms by
4.9 the coefficient of the squared term: 

Divide each side by '4.9'.
-2.448979592 + 2.857142857x + x2 = 0

Move the constant term to the right:

Add '2.448979592' to each side of the equation.
-2.448979592 + 2.857142857x + 2.448979592 + x2 = 0 + 2.448979592

Reorder the terms:
-2.448979592 + 2.448979592 + 2.857142857x + x2 = 0 + 2.448979592

Combine like terms: -2.448979592 + 2.448979592 = 0.000000000
0.000000000 + 2.857142857x + x2 = 0 + 2.448979592
2.857142857x + x2 = 0 + 2.448979592

Combine like terms: 0 + 2.448979592 = 2.448979592
2.857142857x + x2 = 2.448979592

The x term is 2.857142857x.  Take half its coefficient (1.428571429).
Square it (2.040816328) and add it to both sides.

Add '2.040816328' to each side of the equation.
2.857142857x + 2.040816328 + x2 = 2.448979592 + 2.040816328

Reorder the terms:
2.040816328 + 2.857142857x + x2 = 2.448979592 + 2.040816328

Combine like terms: 2.448979592 + 2.040816328 = 4.48979592
2.040816328 + 2.857142857x + x2 = 4.48979592

Factor a perfect square on the left side:
(x + 1.428571429)(x + 1.428571429) = 4.48979592

Calculate the square root of the right side: 2.118913854

Break this problem into two subproblems by setting 
(x + 1.428571429) equal to 2.118913854 and -2.118913854.

Subproblem 1

x + 1.428571429 = 2.118913854 Simplifying x + 1.428571429 = 2.118913854 Reorder the terms: 1.428571429 + x = 2.118913854 Solving 1.428571429 + x = 2.118913854 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.428571429' to each side of the equation. 1.428571429 + -1.428571429 + x = 2.118913854 + -1.428571429 Combine like terms: 1.428571429 + -1.428571429 = 0.000000000 0.000000000 + x = 2.118913854 + -1.428571429 x = 2.118913854 + -1.428571429 Combine like terms: 2.118913854 + -1.428571429 = 0.690342425 x = 0.690342425 Simplifying x = 0.690342425

Subproblem 2

x + 1.428571429 = -2.118913854 Simplifying x + 1.428571429 = -2.118913854 Reorder the terms: 1.428571429 + x = -2.118913854 Solving 1.428571429 + x = -2.118913854 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.428571429' to each side of the equation. 1.428571429 + -1.428571429 + x = -2.118913854 + -1.428571429 Combine like terms: 1.428571429 + -1.428571429 = 0.000000000 0.000000000 + x = -2.118913854 + -1.428571429 x = -2.118913854 + -1.428571429 Combine like terms: -2.118913854 + -1.428571429 = -3.547485283 x = -3.547485283 Simplifying x = -3.547485283

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.690342425, -3.547485283}

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